Materials Literature
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We study the epitaxial growth of pyramidal patterns in stochastic systems with interacting adsorbate within the framework of the phase-field approach based on the Burton–Cabrera–Frank model. Considering the statistical criteria of pattern formation, it is shown that the system dynamics is governed by the interaction s…
Organoarsenic drugs such as roxarsone and 4-arsanilic acid are poultry feed additives widely used in US broilers to prevent coccidosis and to enhance growth and pigmentation. Despite their veterinary benefits there has been growing concern about their use because over 90% of these drugs are released intact into litter…
The ecotoxicological effects of carbon nanomateriales (CNMs), namely fullerenes and carbon nanotubes, on algae, fungi and plants are analyzed. In different toxicity tests, both direct and indirect effects were found. The direct effects are determined by nanomaterial chemical composition and surface reactivity, which m…
The modified BaTiO 3 dielectric ceramics have been prepared by different sintering methods with grain size of ∼100 nm. The dielectric properties, core–shell structure, and the dopant distribution in ceramic grains were studied. It is found that the diffuse phase transition peak shifts to the lower temperature as the s…
We study the influence of an external magnetic field on the collective electronic excitations in metallic nanoparticles. While the usual surface plasmon corresponding to the collective oscillation of the electrons with respect to the ionic background persists in the direction parallel to the magnetic field, the compon…
The reactivity of surface hydroxyls on FeO(111) monolayer films on Pt(111) with different oxygen vacancy concentrations has been investigated by means of X-ray photoelectron spectroscopy, thermal desorption spectroscopy, low energy electron diffraction, and density functional theory calculations. Surface hydroxyls on…
Ordered ultrathin tungsten oxide films were prepared on a Pt(111) substrate at 700 K via direct sublimation of monodispersed cyclic (WO 3 ) 3 trimers. The surface composition, structure, and morphology were determined using a combination of atomically resolved imaging, ensemble-averaged surface-sensitive spectroscopie…
Ferroelectric and multiferroic materials present a nonlinear variation in their permittivity due to domain wall motion. Currently, this variation is described either by the Rayleigh law for fields above a threshold or by a power law for soft ferroelectrics. We propose a hyperbolic law based on the contributions of dom…
Using metalorganic chemical vapor deposition, we have grown ZnO nanowires (NWs) on ZnO(0001) as well as on Al2O3(0001) and Si(111) substrates. The optical properties of these NWs are studied by continuous-wave and time-resolved photoluminescence spectroscopy. Both the spectral and the temporal characteristics of the N…
Phase pure, fine ZrW 2−δ Mo δ O 8 powders with 0.00≤δ≤0.91 were synthesized by a hydrothermal route. As‐synthesized particles exhibited a chemical composition consistent with zirconium tungstate–molybdate hydroxide dihydrate (Zr(W,Mo) 2 O 7 (OH) 2 ·2H 2 O). Transmission electron microscopy revealed a rod‐like morpholo…
The performance of a magnetic resonance imaging contrast agent (CA) depends on several factors, including the relaxation times of the unpaired electrons in the CA. The electron spin relaxation time may be a key factor for the performance of new CAs, such as nanosized Gd 2 O 3 particles. The aim of this work is, theref…
Gold-phosphine cluster growth was studied at the BP86/TZV level of theory, starting from the precursor AuClPR 3 (R = H, Me, and Ph), up to clusters containing four gold atoms. For all three substituents, AuClPR 3 is linear. For R = H and R = Me, the anionic species AuClPR 3 − are bent, whereas for R = Ph, it is linear…
Well‐crystallized cuprous oxide (Cu 2 O) nanoparticles were successfully fabricated using a microemulsion (ME) method. A solution containing copper (I) element for hydrolysis reaction in small water droplets was obtained using copper (I) acetate as the raw material with the appropriate addition of chelating agents ( n…
We present an in situ method of n-doping graphene by exfoliating in an N-ambient. By exfoliating single-layer graphene in a nitrogen-rich environment, the dopant specie plays an active role in minimizing C–C reconstruction that typically occurs at the moment of defect generation. Employing such in situ methods provide…
We use neutron scattering to study the magnetic-field effect on the static antiferromagnetic (AF) order and low-energy spin excitations in the underdoped iron arsenide superconductor BaFe${}_{1.92}$Ni${}_{0.08}$As${}_{2}$. At zero field, superconductivity that occurs below a critical temperature of ${T}_{c}=17$ K coin…
(Na 0.85 K 0.15 ) 0.5 Bi 0.5 TiO 3 (NKBT) and B‐site‐substituted NKBT by Sc, i.e. (Na 0.85 K 0.15 ) 0.5 Bi 0.5 Ti (1− x ) Sc x O 3 (NKBT‐Sc x , x =0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and 0.4) thin films were prepared on Pt/Ti/SiO 2 /Si(100) substrates by an aqueous sol–gel method. Structures and electrical characteristic…
Aqueous foams stabilized by ceramic and thermoplastic polymeric particles provide a general method for producing novel porous materials because their extraordinary stability against disproportionation and drainage allows them to be dried and sintered into solid materials. Here, we report the different microstructures…
The absorption of lithium in montmorillonite [LiSi8(Al3Mg)O20(OH)4] was investigated using Density Functional Theory (DFT). The final position of lithium after absorption was found to be in good agreement with an experimental observation where lithium atom migrated from the interlayer into the vacant octahedral site o…
We study the complexation of nontoxic, native poly(propyl ether imine) dendrimers with single-walled carbon nanotubes (SWNTs). The interaction was monitored by measuring the quenching of inherent fluorescence of the dendrimer. The dendrimer-nanotube binding also resulted in the increased electrical resistance of the h…
We report results of theoretical simulations of optical field enhancement in a system consisting of spherical and hemispherical noble metal nanoparticles on a smooth titania surface, which is a model system relevant to applications in photo-catalysis and solar energy harvesting. Simulations conducted using Finite-Diff…